take out the Drake and make everything 4. Ethereal Armor in this deck is fucking stupid as well as Aqueous Form . Nothing is better than going turn 3 Fabled Hero , Turn 4 Armour, Form, Swing for 12 scrying 1, and having a counterspell open? Hidden Strings would do wonders in this because you can trigger 2 Heroic triggers and if it hits, even more.

Cavalry Pegasus does what Sapphire Drake does for 4 less mana, but without everything needing coutners already.

I run something similar. Hidden Strings is awesome tech, as it clears a blocker and triggers heroic.

I really like your idea, i've been working on a very similar deck for a while now, too.